Mold and centering device.



PATENTED MAY 21, 1907.

J. B. BLAW. MOLD AND GENTERING DEVICE.

APPLIOATION FILED JUNE 6.1906.

Wm? KM If W I I mold securely in position; to provide a mold rm'rrnn snares Parana @FMQE.

Jason B. BLAW, or riT'rsBURe, PENNSYLVANIA, ASSIGNOR TO BLAW COLLAPSIBLE STEEL. (ENTERING-COMPANY, or PITTSBURG, PENN- SYLVANIA, A CORPORATION or NEW JERSEY.

. Mon-D AND cam-same DEVICE;

.Specification of Letters Patent.

' Application filed June 6,1906- Serial No. 320,394.

Patented May 21, 1907.

Devices, oiwhich the following is a specification. I

- My invention relates to a collapsible mold.

and cente'rin device used in the construction of sewers an other passages and has-for its objects; .to .providea positive and effective collapsin mechanism for the mold} to provide a co lapsing mechanism which in its ex p'anded position will hold the parts of the 1 in which the collapsing means may be easily and conveniently operated from the end of the mold and finally to provide a construction of mold and collapsing means wherein the mold presents a smooth outer surface and in which a fulcrum for the collapsing means is.-secured directly against the sides of the sewer. One form of the invention whereby the above and other objects are secured is illustrated in the accompanying drawing in which Figure 1 represents a transverse section of a portion of a mold embodying my invention.

Figure 2 represents a longitudinal section thereof. a v

Figure 3 represents a perspective view of detached portionsof the mechanism em ployed.

" Referring tothe drawings: A designates opposite independent sections of a mold or centering device for a sewer or conduit. Connected. with the interior of the sections are the angle irons B with which are pivot are operated,said boltbemg providedwith a nut F. .The outer ends of said levers are .pivotally connected by the ears G withthe plates H which latter are disconnected from the sections A and occupy o enings therein,

but form continuities of t e latter. The

sides of said plates andthe walls of the openings which they occupy areinclined forming the tapering joints J. The levers C are connected by the pin or bolt E with the movable barsK a portion of each of which has a threaded stem L extending therefrom, the same being freely mounted on the beam or frame M and prevented from turning therein by a'suitable feather. Fitted on saidstem L is the wheel N whose hubis internally threaded so as'to engage'with the threads of said stem, said hub being swiveled on said beam, whereby by rotating the wheel rec1lprocatory motion may be imparted to t e stem L and consequently to the bar K, whereby the toggle may be opened or closed and corresponding motions imparted to the levers C. In order to apply t GBXPaIIdlIIg and contracting mechanism to diffcrentportions of the interior of the molds, the bars -K each have connected with them a stem Which is formed in sections P, Q, the same engaging with the bu'ckle R affording means of adiusting the various parts of the expanding-and contracting mechanism, the section-Q being adapted to extend to another pair of toggle levers, whereby the latter may be operated similarly to the levers C.

Another feature of myinvention resides in the means for supporting the opposing edges of the mold sections A, A. This means comprises theangles S and T rivetedrespectively to the upper and lower mold sections. The member S is bent to; form an obtuse an le and the member T to form an acute angle. It will be seen that by this arrangement an effective supporting surface is provided between the upper member A" and the lower 'member A. Ihe slanting of the legs of the .tWo angles subserves an important function the upper member has been contracted, the 'lower member may be similarly contracted.

It will be-apparentthat if desired the construction-might be modified by bending the edges of the members A irf orderto form an gles instead pf riveting the angles S and T to such edges. In some cases also it may be deated so as to move the levers C to the left,

whereby the. angle irons B and consequently the portions of the sections A with which they are connected are drawn inwardly, thus contracting or collapsing said sections. During the motion of said levers C, the arms G have the? fulcra on the plates H and the lat ter, owing to their disconnection from the sections, bear outwardly against the material of the sewer, as abutments and supports,

while the arms C describe radial motions thus drawing in the sections as has been stated. As the arms continue to describe their radial motions, the plates H will also be drawn inwardly, at which time the sections are so disconnected from the sewer as to be in condition to be removed and placed in another portion of the trench orexcavation so as to form another length of the sewer.

It will be apparent from the foregoing that the collapsing means constitutes a very positive device as the plates H which constitute the fulcrum supports rest directly against the solid wall of the sewer-and the lever arms act to the best advantage and form a powerful operating means. It will also be seen that the smooth outer surface of the mold is maintained and that when completely collapsed every part of the mold including the plates H is disengaged 'from the sewer wall.

It will be seen that the construction illustrated and described -is capable of various modifications without departing from the spirit of the invention. It will be apparent that the shape of the plates H might be changed or thearrangement of operating levers might be modified and the device still operate on the broad principle involved which requires only that one part of the mold be stationary with regard to the rest of the mold and that such part actas the fulcrum support for the operating means. It will also be apparent that some means for operating the rod K'other than the parts L, M, and

N, might be substituted such as an arrangement of levers, or such operating means be done away with entirely and the rod K operated directly. These and other modifications which will occur to those skilled in the art are comprehended by my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is the following.

1.-In a'mold, a collapsible mold section having a disconnected art comprising aportion of the wall thereof and means connected with said part and section whereby said section may be contracted and said part form a bearing for said means.

2.In a mold, a collapsible mold section having a disconnected part comprising a portion of the wall thereof, a lever connected with said section and part and means for operating said lever'whereby said section may be contracted.

3.In a ntold, a collapsible mold section having a disconnected part eomprisin a portion of the wall thereof, a lever pivotally connected with said section and part and means for operating saidlever whereby said section may be contracted and said part pressed against the sha ed material around the mold.

4.In a 'mo d, a collapsible mold section having a disconnected part comprising a portion of the wall thereof, a lever pivotally connected with both section and part, a means for o erating said lever whereby said section may e contracted and said part first pressed against the shaped material around the mold and next drawn inwardly from said material.

5.In a mold, a collapsible mold section, a disconnected part in the wall thereof, a lever connected with said section and part and provided with an arm arranged so that a lateral movement of said arm is adapted to draw said section from the molded sewer wall and a further movement of said arm is adapted to draw said disconnected part from the sewer wall, whereby the mold may beremovcd.

6.In a mold of the character stated, a collapsible mold section, a lever connected with said section from within the latter for respectively contracting and expanding the same, a bar connected with said lover, a fulcrum member adapted to be supported independent of the mold section, and means co, operating with the fulcrum member and the bar for moving said bar in opposite directions.

7.In a mold, a collapsible mold section, a lever connected with said section from within the latter for respectively contracting I and expanding the same, a bar connected with said lever, a screw attached to said bar, a bearing member for the screw adapted to be supported independent of the mold section and means on the bearing membercooperatingwith the screw whereby the screw may be reciprocated.

8.In a mold, a semieylindrical collapsible mold section, disconnected sections constituting portions of the wall thereofand located adjacent the edges of thesectiorl, levers having arms pivoted to such discohnectcd sections and to the collapsible sections and-a single means foroperating the levers.

9.----In a mold, a semicylindrical mold section of sheet metal having disconnected )arts near the edges compi'isingportions ol' the tion whereby said section may be contracted and said part form a bearing for said means.

In. testimony whereof I have hereunto signed my name in the'presence of the two subscribed Witnesses.

walls'thereof, and means connected with the section and said disconnected parts whereby said section may be contracted and said parts form bearings for said means.

5 10.In a mold, a collapsible mold. section having a disconnected pert previded with beveled edges adapted to fit SlIIllliH' beveled edges in the mold section and comprising; e Witnesses:

portion of the Well of such mold section and i J. O. BRADLEY,

10 means connected with said part and sec l F111. GAITHER.

JACOB B. BLAVV. 

